Cryptology: Classical and Modern PDF

PREFACE

phy is desired, as well as some or all of Chapters 10–12 in more advanced courses. Parts of the book could also be used in courses designed to be free of traditional mathematics. Specifically, Chapters 1–3, Section 4.1, Chapter 5, and Sections 7.1–7.2 are essentially free of traditional mathematics.

The first edition of this book included detailed instructions for the use of a technology resource that we have found to be very useful with certain parts of the book. More specifically, in order to include more substantive examples and exercises with the techniques presented in this book, the first edition of the book incorporated Maplets, a technology resource much like Java applets, but which use the engine of the mathematics software package Maple. For the second edition of this book we have moved these instructions, examples, and exercises online, posting them along with all of our Maplets at https://www.radford.edu/npsigmon/cryptobook.html. The reason for this move is threefold. First, it continues to be easy to use the printed second edition of this book without an advanced technology resource. In short, every example and exercise in the printed second edition of this book can be completed with either no technology or a simple hand- held calculator. Second, although most of our Maplets can still be used even by users who have not purchased or downloaded Maple, the ever-increasing availability of free technology resources online for many of the techniques presented in this book means it continues to become easier for users of the book to find and choose their own technology resources. Third, although our Maplets continue to work, Maplesoft, Inc. no longer provides updates or active support for them. Moving our Maplet materials online allows us to provide our own support to users of this book by being able to more easily modify our Maplets and instructions for their use.

We wish to thank Dr. Joe King, former Director of the Honors Academy at Radford University, for his strong support as we developed the course and this book. We are also grateful to Willis Tsosie of Din´e College, whose uncle Kenneth was a Navajo code talker, for his inspiration as we developed our section on the Navajo code, and for providing the spoken code words for the Navajo code Maplet that is included in our online materials. We also wish to thank our mentor and friend, Dr. Ernie Stitzinger of North Carolina State University, for his encouragement, interest in our projects, and guidance in our own education and careers. Finally, we wish to thank our families, especially Vicky and Mandy, for their patience and support.

We welcome comments, questions, corrections, and suggestions for fu- ture editions of this book, and sincerely hope that you enjoy using it.

Authors: Richard E. Klima, Richard Klima, Neil P. Sigmon, Neil Sigmon